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A CATFIGHT broke out at the funeral reception for legendary producer Guy McElwaine Saturday when Christine Peters spotted her nemesis Alana Stewart.

The two have been feuding since Christine and her ex-husband Jon accused Sean Stewart, 27, of stealing Jon’s car last month and of being a bad influence on their daughter Caleigh, 19.

Jon – the producer of such hits as “Shampoo,” “Flashdance,” “Rain Main” and “Caddyshack” – is pressing charges against Sean, the son of Rod Stewart, for swiping his Cadillac Escalade – an accusation Sean’s lawyer denies, claiming Sean was lent the vehicle by Caleigh.

When Christine saw Stewart at Cindra and Alan Ladd‘s house after the funeral for the “Good Shepherd” producer, she went “crazy,” said one witness.

“Alana and Courtney Wagner were walking into the dining room when they were stopped by Christine,” our spy said.

“Christine said something about ‘the situation,’ and Alana said, ‘We can resolve this nicely. I am nice and forgiving, but you need to stop going around town calling my son trash.’ ”

Christine, infuriated, shot back, “You need to tell him to get out of my daughter’s life!” which prompted Alana to say, “Maybe you should tell your daughter that! She’s 19 years old – stop trying to control her and let her sort it out.”

Christine then screamed, “Maybe if you’d been in [Sean’s] life a little more, he wouldn’t have turned out this way!” – referring to his multiple arrests for assault last year.

At this point, Wagner had had enough and stepped in, said our spy, and said, “Christine, you are being inappropriate. This is not the place for this. You need to leave.”

Alana told us, “I was shocked and appalled at her behavior. It was not the time or place for this conversation.” A rep for the Peters declined to comment.

Meanwhile, Christine and Jon are further trying to separate the star-crossed lovers – and have sent Caleigh to rehab, at the Canyon Rehab center in Malibu, spies said.

Caleigh is said to be so furious at her parents for “persecuting” Sean, she is threatening to leave rehab if Jon presses charges.